Which QoS mechanism is used to implement CoPP?

RSVP (Resource Reservation Protocol) is used for reserving network resources for specific application flows to guarantee QoS, not for policing traffic destined for the router's control plane.

While CoPP often involves policing (a form of rate limiting), 'rate limiting' itself is a specific action, not the overall QoS mechanism or framework (MQC) that enables the implementation of CoPP.

FIFO (First-In, First-Out) is a basic queuing discipline that simply processes packets in the order they arrive, and it does not provide the classification and policing capabilities essential for CoPP.

Control Plane Policing (CoPP) is implemented using the Modular QoS CLI (MQC) framework, which provides a structured and flexible approach to define traffic classes, apply policies (such as policing, marking, or queueing), and then attach these policies to control plane traffic.